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# STAT 151 (September 25, 2013) Chapter 14: Introducing Probability | Chapter 15: Probability Rules

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School
Department
Statistics
Course
STAT151
Professor
Paul Cartledge
Semester
Fall

Description
STAT 151 (September 25, 2013) Chapter 14: Introducing Probability | Chapter 15: Probability Rules  Experiments result in only 1 out of many outcomes o Probability is used to measure the chance that a certain outcome will occur 3 Conceptual Approaches to Probability 1. Classical Probability a. Rule: P(A) = (# of A of outcomes)/(Total # of outcomes) 2. Relative frequency concept of probability a. An experiment is repeated n times to simulate probability b. The more an experiment is conducted, the more closer the relative frequency approaches the theoretical probability 3. Personal/subjective probability a. Amount of “belief” that a certain outcome will occur Sample space (S) – set of all elementary outcomes of an experiment Elementary outcomes – simplest outcomes that exist (eg. The elementary outcomes of rolling a 6-sided die are 1, 2, 3, 4, 5, 6) Event – is a subset of elementary outcomes (Denoted: )  A union of 2 events is denoted A or B (or )  An intersection of 2 ev
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